Which cycle involves the movement of carbon among the atmosphere, oceans, soil, and living organisms?

• A. Biogeochemical Cycle
• B. Convergent Evolution
• C. Chlorophyll
• D. Carbon Cycle

Answer: (D)

Carbon moves through air, water, soil, and living things in a cycle known as the carbon cycle. It tracks where carbon atoms go as they cycle between reservoirs and processes: plants fix carbon from CO2 during photosynthesis; animals and microbes release carbon back via respiration and decay; seawater exchanges CO2 with the atmosphere and supports carbonate chemistry; soils store carbon as organic matter; and some carbon becomes buried in sediments and fossil fuels long-term. This cycle is a type of biogeochemical cycle, but it is the one specifically about carbon. Other options describe unrelated concepts or refer to biogeochemical cycles in general, not the carbon-focused pathway.